(;AW[bc]AW[cd]AW[ce]AW[cf]AW[bg]AW[dg]AW[dh]AB[cb]AB[eb]AB[cc]AB[bd]AB[dd]AB[ed]AB[be]AB[bf]MA[bc]C[What can white accomplish with this stone?]PL[W] (;W[ad];B[bb] (;W[ab]C[Ko. If white wins it, the three black stones are dead.RIGHT]) (;W[af];B[ac]C[This doesn't work.]) (;W[ac];B[ab]C[No, this achieves nothing.])) (;W[af];B[bb]C[Nope.]) (;W[bb];B[ba] (;W[ad];B[ab]C[No.]) (;W[ab];B[ca] (;W[ad];B[aa]C[No good.]) (;W[af];B[aa]C[Nope.])) (;W[ac];B[ad]C[Failure.])) (;W[ac];B[bb]C[No, descending doesn't work.]) (;W[ab];B[ad] (;W[bb];B[ba]C[No good.]) (;W[ac];B[bb]C[Dead.]) (;W[af];B[bb]C[That does not work.])) (;W[ae];B[ac] (;W[af];B[bb]C[Failure.]) (;W[bb];B[ab]C[No good.]) (;W[ab];B[bb]C[Failure.])))